GitHub has introduced a global issue search feature to streamline the process of locating specific issues across more than a million open issues in public repositories. This new feature allows users to perform a single query to search issues in all public repositories and private repositories they have access to, with options to restrict results to a specific organization or user. Accessible via the global search page, the feature includes various filters to refine searches, such as searching by state, comments, labels, authors, mentions, assignees, and creation or update dates. This enhancement, highlighted by Tim Pease, aims to reduce the tedium of manually searching through individual repositories, making it easier and more efficient to find relevant issues.